George William Hill was an American astronomer and mathematician. Working independently and largely in isolation from the wider scientific community, he made major contributions to celestial mechanics and to the theory of ordinary differential equations. The importance of his work was explicitly acknowledged by Henri Poincaré in 1905. In 1909 Hill was awarded the Royal Society's Copley Medal, "on the ground of his researches in mathematical astronomy". Hill is remembered for the Hill differential equation, along with the Hill sphere.

John William Hill or often J.W. Hill was a British-born American artist working in watercolor, gouache, lithography, and engraving. Hill's work focused primarily upon natural subjects including landscapes, still lifes, and ornithological and zoological subjects. In the 1850s, influenced by John Ruskin and Hill's association with American followers of the Pre-Raphaelite Brotherhood, his attention turned from technical illustration toward still life and landscape.